• CN:11-2187/TH
  • ISSN:0577-6686

›› 2005, Vol. 41 ›› Issue (3): 221-225.

• 论文 • 上一篇    下一篇

形状记忆合金智能复合材料自修复中传感与控制方法研究

朱玉田;萩原一郎;毛利泰裕   

  1. 同济大学机械工程学院;东京工业大学大学院机械科学科
  • 发布日期:2005-03-15

RESEARCH ON SENSING AND CONTROL OF SHAPE MEMORY ALLOY EMBEDDED IN INTELLIGENT MATERIAL

Zhu Yutian;Hagiwara Ichiro;Yasuhiro Mohri   

  1. College of Mechanical Engineering, Tongji University Department of Mechanical Engineering and Science, Tokyo Institute of Technology
  • Published:2005-03-15

摘要: 对于埋入形状记忆合金丝的智能材料,提出了通过监测电阻的变化来传感外应力引起的应变、判断基材的损伤情况,同时使用参考形状记忆合金丝补偿温度引起的应变,消除传感误差。在结构自修复过程中,由于环境温度、热对流和热辐射条件以及加热电流强度不同等因素致使形状记忆合金的温度状态难以确定,为了尽快让裂缝闭合、在最短时间促成形状记忆合金的相变并防止因过热而烧毁基材或形状记忆合金丝,提出了一种基于电阻变化率反馈的动态自传感加热方法,可以实时监测相变的起始点和结束点,有效地防止过热。试验结果与理论分析吻合良好。

关键词: 加热控制, 形状记忆合金, 应变传感, 智能材料, 自修复

Abstract: For intelligent materials embedded with shape memory alloy (SMA) wires, a method based on checking the resistance variation of the SMA is proposed. By this method, the strain caused by tensile load can be measured and the damage of the matrix be estimated. The strain caused by the temperature effect is compensated; hence the sensing error is eliminated by using a reference SMA wire. During the self-repair process, generally the temperature state of SMA wires embedded in composites is uncertain due to the ambient temperature, the heat convection, the heat radiation or the external current inputted for heating, to suppress the crack(s) by inducing the SMA phase transformation as fast as possible but not to overheat or burn the matrix or the SMA itself, a dynamic heating/self-sensing method which can detect the beginning and the ending of the SMA phase transformation based on the feedback of the SMA resistance variation is proposed and verified in laboratory experiments. Analytical solutions are compared favorably with the experimental data.

Key words: Heating control, Intelligent material, Self-repair, Shape memory alloy, Strain sensing

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